What if there's nothing deterministic in this universe? The notion of determinism deduced from God, Nature, or whatever is the key behind the concept of free w

What if there's nothing deterministic in this universe? The notion of determinism deduced from God, Nature, or whatever is the key behind the concept of free will. Otherwise, how can we identify free will, which is essentially a fancy term for "non-determinism"? The concept of free will cannot stand by itself without the notion of determinism. In other words, if everything is truly random, then there's no room for both determinism and free will. However, I don't think the structured randomness described by quantum mechanics counts for the randomness that truly goes beyond both determinism and free will. It may be incomprehensible for any of internal observers of this universe.